I'm new to grid960. I have a simple layout that seems to work most of the time. However sometimes the right 4 unit wide div (black) wraps over to the far left and displays below the end of the 12 unit div(white).

2 answers

first of all, you can drop the omega class. you only need that if you're nesting columns inside of other grid columns; you don't need it for immediate children of the container. for example: if you put 2 more divs inside of the 'div.grid_4' that you have now, you could give each a class of grid_2 and the first one you would also add the alpha class and then add the omega class to the second one. this would remove the margins on the left and right side respectively, so they don't break outside of the width of their containing div.

what are the "a" and "c" classes for? i can't really tell what you're problem is but just consider the fact that this is a fixed-width grid and margins and padding will affect the flow of your columns so you should check around in that area of things as a start.